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How does facebook, gmail send the real time notification?
... read some posts about this topic and the answers are comet, reverse ajax, http streaming, server push, etc.
5 Answers
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How to See the Contents of Windows library (*.lib)
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LIB.EXE is the librarian for VS
http://msdn.microsoft.com/en-us/library/7ykb2k5f(VS.80).aspx
(like libtool on Unix)
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How do I implement a callback in PHP?
...cb(). call_user_func and call_user_func_array support all the above.
See: http://php.net/manual/en/language.types.callable.php
Notes/Caveats:
If the function/class is namespaced, the string must contain the fully-qualified name. E.g. ['Vendor\Package\Foo', 'method']
call_user_func does not supp...
SQL command to display history of queries
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You can look at the query cache: http://www.databasejournal.com/features/mysql/article.php/3110171/MySQLs-Query-Cache.htm but it might not give you access to the actual queries and will be very hit-and-miss if it did work (subtle pun intended)
But MySQL Que...
What is the difference between re.search and re.match?
What is the difference between the search() and match() functions in the Python re module ?
8 Answers
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Rails Migration: Remove constraint
...ke so
change_column :users, :address, :string, :null => true
Docs...
http://apidock.com/rails/ActiveRecord/ConnectionAdapters/SchemaStatements/change_column
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Heroku 'Permission denied (publickey) fatal: Could not read from remote repository' woes
I've searched around for many hours on end looking to a solution to my seemingly easy-to-fix problem. It's not that my search turned up nothing, it's that my search turned up so many different solutions -none of which have worked.
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What are all the valid self-closing elements in XHTML (as implemented by the major browsers)?
What are all the valid self-closing elements (e.g. ) in XHTML (as implemented by the major browsers)?
13 Answers
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Default behavior of “git push” without a branch specified
...me name.
What has been discussed so far can be seen in this thread:
http://thread.gmane.org/gmane.comp.version-control.git/192547/focus=192694
Previous relevant discussions include:
http://thread.gmane.org/gmane.comp.version-control.git/123350/focus=123541
http://thread.gmane.org/gmane...
What are all the differences between src and data-src attributes?
...a-xxx that you want to select.
MDN documentation on data-xxxx attributes: https://developer.mozilla.org/en-US/docs/DOM/element.dataset
Example of src on an image tag where the image loads the JPEG for you and displays it:
<img id="myImage" src="http://mydomain.com/foo.jpg">
<script>
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